New package: mypaint-1.1.0_1

MyPaint is a digital painting program, roughly comparable to Krita from the Calligra-Suite, although much more lightweight.
```
[juan@leysa void-packages]$ xbps-query -RX python-cairo
pygtk-2.24.0_12
```

That means that if your package depends on `pygtk`, `python-cairo` will be added as dependency of `pygtk`. Our `python-cairo` package is currently `1.10`... it's unnecessary to specify `>=1.14` because will always be true.